Process for preparing aminonaphthalene derivatives in a titanium or titanium alloy reactor

Abstract

Aminonaphthalene derivatives are prepared by reacting the corresponding naphthol derivative with ammonia or amines in the presence of bisulfites. The reaction is carried out in a continuous procedure in reaction apparatus which consists wholly or partly of titanium or a titanium alloy, carbon largely excluded. Suitable alloys are titanium/palladium, titanium/nickel or titanium/molybdenum.

What is claimed is: 
     
       1. In a process for preparing aminonaphthalene derivatives wherein the corresponding naphthol derivative is reacted with ammonia or amines in the presence of bisulfites, the improvement which comprises carrying out the reaction in a continuous procedure in reaction apparatus which consists wholly or partly of titanium or a titanium alloy, wherein the elementary carbon content in the system used is less than 0.1% by weight. 
     
     
       2. Process of claim 1 wherein the reaction is carried out in reaction apparatus made of a titanium/palladium, titanium/nickel or titanium/molybdenum alloy. 
     
     
       3. Process of claim 1 wherein a titanium/palladium alloy with 99.0 to 99.5% by weight of titanium and 0.05 to 0.2% by weight of palladium is used. 
     
     
       4. Process of claim 1 wherein a titanium/nickel alloy with 97.0 to 99.5% by weight of titanium and 0.5 to 3.0% by weight of nickel is used. 
     
     
       5. Process of claim 1 wherein a titanium/molybdenum alloy with 50.0 to 80.0% by weight of titanium and 20.0 to 50.0% by weight of molybdenum is used. 
     
     
       6. Process of claim 1 wherein a titanium material which consists of 99.848% by weight of titanium, 0.03% by weight of iron, 0.01% by weight of carbon, 0.01% by weight of nitrogen, 0.1% by weight of oxygen and 0.002% by weight of hydrogen is employed. 
     
     
       7. Process of claim 1 wherein a titanium/palladium alloy which consists of 99.36% by weight of titanium, 0.2% by weight of palladium, 0.2% by weight of iron, 0.08% by weight of carbon, 0.05% by weight of nitrogen and 0.05% by weight of hydrogen is used. 
     
     
       8. Process of claim 1 wherein a multi-chamber reactor is used as the reaction apparatus. 
     
     
       9. Process of claim 1 wherein a multi-chamber reactor with 10 to 20 chambers is used as the reaction apparatus.